how to work paypal cart properly

[allstarfaces]

i am using paypal cart but have to have 2 pay now buttons so i can have to shipping charges i tried to change html code but it didnt work wrote to paypal no reply, also how do you get rid of the quantity tick box i only have 1 of each will it tell the next person who buys it is sold out for me or do i have to set that up some how to please please help